Type 1 · Individual ✓ Active NPI ✓ Valid NPI checksum

Dr. Ronald Tsao, M.D.

Internal Medicine Physician in Redondo Beach, CA · enumerated 2010.

Data current as of Jul 13, 2026 · sourced from CMS NPPES

National Provider Identifier

1770802746

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Registry record

Entity type Individual (Type 1)

Name Dr. Ronald Tsao

Credential M.D.

Sex Male

Practice address 514 N Prospect Ave, Redondo Beach, CA, 90277

Phone (310) 937-8555

Enumeration date May 28, 2010

Last updated in NPPES Oct 13, 2017

Taxonomy & licenses

207RS0010X Sports Medicine (Internal Medicine) Physician Allopathic & Osteopathic Physicians · License A138271 (CA) Secondary

208000000X Pediatrics Physician Allopathic & Osteopathic Physicians · License A138271 (CA) Secondary

207R00000X Internal Medicine Physician Allopathic & Osteopathic Physicians · License A138271 (CA) Primary

MD · Doctor of Medicine: A physician who completed medical school (allopathic medicine), residency training, and state licensure. About the MD credential

What is an NPI number?

A National Provider Identifier (NPI) is a unique 10-digit number that CMS assigns to every U.S. healthcare provider and organization under HIPAA. Type 1 NPIs identify individual providers; Type 2 NPIs identify organizations. The NPI appears on insurance claims, prescriptions, and credentialing paperwork, and never changes, even if the provider moves or changes specialty.

Read the full guide → Validate an NPI →

Frequently asked questions

What specialty is Ronald Tsao?

Ronald Tsao is registered in NPPES with the primary taxonomy of Internal Medicine Physician. The taxonomy code describes the provider's classification and area of specialization for claims and credentialing.

Is this the official NPI registry?

No. NPI Portal is a private site built on public CMS NPPES data. The official registry is npiregistry.cms.hhs.gov, operated by CMS.

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Source: CMS NPPES (public data). Snapshot 2026-07-13. Provider record last updated 2017-10-13.